MARIETTA, Ga. (AP) — Police are investigating after a semitrailer struck a man walking in the middle of Interstate 75 northwest of Atlanta.

Marietta police say 26-year-old Joshua Edwards of Atlanta was walking on I-75 near Allgood Road shortly after 1 a.m. Wednesday.

Police say he was struck by a semi driven by 53-year-old Tonya Martin of Cartersville, who was heading northbound in the middle lane of the freeway.

Police say they don’t know why Edwards was walking on I-75. No charges have been filed.